ITP1_9_D 文字列変換をC++で解いてみた[AIZU ONLINE JUDGE]

#include <bits/stdc++.h>
using namespace std;

string replace(string str, int a, int b, string p) {
    int j = 0;
    for(int i = a; i <= b; i++) {
        str[i] = p[j];
        j++;
    }
    return str;
}

string reverse(string str, int a, int b) {
    string tmp = str;
    int j = a;
    for(int i = b; i >= a; i--) {
        str[j] = tmp[i];
        j++;
    }
    return str;
}

string print(string str, int a, int b) {
    string tmp;
    int j = 0;
    for(int i = a; i <= b; i++) {
        tmp += str[i];
        j++;
    }
    return tmp;
}

int main() {
    string str;
    cin >> str;
    int n;
    cin >> n;
    string method_string, p;
    int a, b;
    string ans[n];
    int j = 0;
    for(int i = 0; i < n; i++) {
        cin >> method_string;
        if(method_string == "replace") {
            cin >> a >> b >> p;
            str = replace(str, a, b, p);
        } else if(method_string == "reverse") {
            cin >> a >> b;
            str = reverse(str, a, b);
        } else {
            cin >> a >> b;
            ans[j] = print(str, a, b);
            j++;
        }
    }

    for(int i = 0; i < j; i++) {
        cout << ans[i] << endl;
    }

    return 0;
}